/*******************************************************************************
 *     ___                  _   ____  ____
 *    / _ \ _   _  ___  ___| |_|  _ \| __ )
 *   | | | | | | |/ _ \/ __| __| | | |  _ \
 *   | |_| | |_| |  __/\__ \ |_| |_| | |_) |
 *    \__\_\\__,_|\___||___/\__|____/|____/
 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

package io.questdb.griffin.engine.functions.test;

import io.questdb.cairo.CairoConfiguration;
import io.questdb.cairo.sql.Function;
import io.questdb.cairo.sql.Record;
import io.questdb.griffin.FunctionFactory;
import io.questdb.griffin.PlanSink;
import io.questdb.griffin.SqlExecutionContext;
import io.questdb.griffin.engine.functions.BooleanFunction;
import io.questdb.std.IntList;
import io.questdb.std.ObjList;

import java.util.concurrent.atomic.AtomicInteger;

public class TestLatchedCounterFunctionFactory implements FunctionFactory {

    public static final String SIGNATURE = "test_latched_counter()";
    private static final AtomicInteger COUNTER = new AtomicInteger();
    private static volatile Callback CALLBACK;

    public static int getCount() {
        return COUNTER.get();
    }

    public static void reset(Callback callback) {
        CALLBACK = callback;
        COUNTER.set(0);
    }

    @Override
    public String getSignature() {
        return SIGNATURE;
    }

    @Override
    public Function newInstance(int position, ObjList<Function> args, IntList argPositions, CairoConfiguration configuration, SqlExecutionContext sqlExecutionContext) {
        return new TestLatchFunction();
    }

    public interface Callback {
        default void onClose() {
        }

        default boolean onGet(Record rec, int count) {
            return true;
        }
    }

    private static class TestLatchFunction extends BooleanFunction {
        private final Callback callback;

        public TestLatchFunction() {
            callback = CALLBACK;
        }

        @Override
        public void close() {
            if (callback != null) {
                callback.onClose();
            }
        }

        @Override
        public boolean getBool(Record rec) {
            int count = COUNTER.incrementAndGet();
            if (callback == null) {
                return true;
            }
            return callback.onGet(rec, count);
        }

        @Override
        public boolean isThreadSafe() {
            return true;
        }

        @Override
        public void toPlan(PlanSink sink) {
            sink.val(SIGNATURE);
        }
    }
}
